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（5分）（1）物质形成分子间氢键和分子内氢键对物质性质的影响有显著差异。根据下表数据，形成分子间氢键的物质是___________ (填物质字母代号)。 代号 物质 结构 水中溶解度/g （25℃） 熔点/℃ 沸点/℃ A 对—硝基苯酚 1.7 114 295 B 邻—硝基苯酚 0.2 45 100 （2）由C、H、O、S中元素构成甲、乙、丙三种分子，所含原子的数目依次为3、4、8，都含有18个电子。甲和乙的主要物理性质比较如下： 熔点／K 沸点／K 标准状况时在水中的溶解度 甲 187 202 2.6 乙 272 423 以任意比互溶 ①1 mol乙分子含有 个σ键； ②丙分子的中心原子采取 杂化轨道； ③甲和乙的相对分子质量基本相同，造成上述物理性质差异的主要原因是 （结合具体物质解释）。
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